Lacon is located in Marshall County. The region is located on the body of water Illinois River. About 1,878 people live here (as of 2020). Between 2010 and 2020, the population declined from 1,937 to 1,878. The region is at 148 meters above sea level. The area covers about 4.3 square kilometers. There are about 73 streets in Lacon. The postal codes are 61540. The dialing code is 309. Lacon is city in Marshall County, Illinois, United States. Among other things, Lacon has restaurants, supermarkets and pharmacies. More information at
laconcity.com.